Web Mail client interface for sendmail

Now I like to get a Web Mail client interface for sendmail (Some thing like Hotmail, Yahoo web interface) where our user can access mail from Internet (anywhere). I do not want to use outlook to download mail.
Can some one tell me where I can get customize webmail interface. Thanks uday kulkarni. NRIs! Choose values with free money transfers!

Hi all,
Presently I am running intranet website with named and apache in my office.I want to start intranet email service among staffs.Can anyone help me with an template software written in Perl or Java so I can modify the codes and make it usable for my organisation.Please help out.
Thanks
Saibal Banerjee
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ITtoolbox redhat-lWe are using Squirrelmail. I am perfectly happy with the performance. Also, the fact that you can plug-in ldap based address book is a tick in my books. The only negative aspect I have heard about, in a high population environment, is that it is resource hungry. If your server is specced highly enough to handle the load I say squirrelmail is ideal.
Users do complain about the usability of Squirrelmail at times. Then again a user wouldn't be a user without some sort of a complaint. Everyone now expects Enchange-like look and feel. Squirrelmail isn't Outlook Web Access. Squirrelmail is far more efficient ;o)
Cheers,
Shidony